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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b005f01b2c5eef1fc3fc83879f0552b6059bae2f4fd088c8db5b1b1569cacf' 
  AND token = 'rLDNev8FVSv9v8Xx8/Zu5UXaBdNIdYzHAwX4XqpfXI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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