SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c33eae75bd81df48ea09319ccffea4abf9ff248cb910fd1fd75cdb0be3e2e0' 
  AND token = '2Offp4yw+Ns6goxbjdhxBJk1Dp4WG5kyZ2k57/NvL/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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