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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e2c3f82b8da4a48f3641a3b4989e9f712bc68fb6ad87d67cd62feedb749645' 
  AND token = 'yPDM18T08O8RelzRXAfWMMjmZjTU/WNvvd4QCQY/4RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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