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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1132f9b5ddf5510aa4bb82311d7aea510d3b709c7ad3a2c4fa94632633212111' 
  AND token = 'pYnF/3Nzy+Z9pat3Zvd2MdyXkhcGD1mGmwoKzhOdeNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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