SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3dbb7779f7164855548637654e49a8055d0e7676279a77e9d0ead3a5de7c63' 
  AND token = 'PkqBFKYxKZ43gYGRCFJahGyvxIJlpwCA5/ChIiOdqm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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