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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8114082747d2c28bb4e596c4aaacb933826f3686ed1761263d2c0dd71c4f1d36' 
  AND token = 'Yd0uQX1psHw6BLNQIsjlyMm3I/q2nckn1vdkkqEmmWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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