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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f29e0d7c195e903c5c8ea1907c8e493c0dd0f8a3fe9d4e857f7f0610891ed54' 
  AND token = '3ztAJy9dORACodzsnAjJT9IIE04B0JnMrbqqnnNiEcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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