SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075fbf9d93ac626d203c4272faa5ea595a7d9e5887c24689e3153c5486b3f63f' 
  AND token = 'B+U6PQlxgGbePVY4NVpraYv/X7k929z6eA4LBmywvBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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