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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe96b33e4951991d96bf9b9041b7db19f7e80b79d5c3bc95346b24df57181a60' 
  AND token = 'hQrqnEp9q3drjVrg+PAj6bLd+OpftiC3NfYYCWh5CQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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