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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb4be96351905b5d823bcbf26f789f7b9e207d806ba4b340f04c93b5df55496' 
  AND token = 'yjHS1S1//TTd7bQtE+bvIsCMsjSuGIoM32WPi5U0ow8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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