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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba103877b8dfe9d0299dff70767dc5ba733d6a921441d475e1c9bc08a5bbe0c7' 
  AND token = '9s823BnQokUpUA3IaaRgtK7k6R6LheFqhq7p5rqgreo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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