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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a990a4cf7339545aa289de2b5e8329c8cc6a38be147f0c89d8c1d09fa0dfa2f5' 
  AND token = 'Nbd9Q2Rg1c++EQfmaBkdIHBxwIXfuj8dOH0sD8Fw2Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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