SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f26de8482d71ca4325e0b32747f5ba7782d5598385f065e1cb300cf71d5a96' 
  AND token = 'nDKXxA0QslUcVveK49G/P/v1l8OFZSTh1xvQiODBWuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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