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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011d6a9625e707d64c0d728b83b4634693656ad8b1ace7e6eed8df54ad659ac6' 
  AND token = 'DeWn65x68ItmjEeJaq8nY+YC17T0GmEie/0+7/mgxkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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