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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddffcddf4e7e877f1080622cf6657105190ce500293cbe266df2a5ff065a3b2d' 
  AND token = 'xkEFf1ZAIMwKj6W3oNEPL/XkNuSjPzeRSFpfOMM+BCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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