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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab80581467a853f762f8c11d3e54c12d6421d1e288524d25f41295e4e04b069' 
  AND token = 'iLNE3DEDVcyHoHmMT078EJhWvwuMIwnzQwbrh1MCxfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}