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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3e6c4b82f9473e62b90a7e8ed5ec753a87d36f5b90877cb5c64feb5540c597' 
  AND token = 'YvWNxosNKuwCRARS/t0WR6Xerl0TKHAeymJ9pJELXIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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