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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630e753981bf175d05f1f9dcb04dafdc5fc2d7c65fe6cc72320056a3abdddd96' 
  AND token = 'j4iYRjaUj+hMbkop3GMZ6g6erQlh17IXOphBg31VSAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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