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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9702cb518a6c54ebf0981d4666501671987359e56c099e040f038199aee360b4' 
  AND token = 'oxy4Q+BxpxfcXUFX4vGt6325veBLNgqdIDCfvyRBYEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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