SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1fa86bdcd782561c86a13c73f19391ffdbea3e97915a12a5eb66633795e883' 
  AND token = 'CHYUdhjphrnJFdL7VqiA6TxODG4jXkuVhnIIYZcQaPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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