SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98f40551b4bd0a719dda796d3e4485833621a605c857b9ff9a74d1f329507d3' 
  AND token = 'Ib56+mtYtZt+4neZZWRqoGwOvb45xpxwB6b1Jwqggoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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