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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6261339f847f6432760bcc34cbaa7e69bce927eb0ca8fdb9fffc23ada6a31a' 
  AND token = '+cdiZP7P2sqS3QvsE0dC7970eHfEiu5j9ocIfN6ZKdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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