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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c79d47433ce6f73ec0998a3113a6c78e29c953daa2eedd37df7224f7bc19f4' 
  AND token = 'kI9oL/98TQuwehAyjicUmtf15Tzbo+KIOJpKKw7X3ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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