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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbe3c2d2d171c8bdea8f0cf5d41707b6962a3da1e4818588b5c6770f3874b48' 
  AND token = 'Pywm2vy7UrF9CnvrZnrwVYA3tkd5j8aYiggLqo8oZgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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