SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2daf7a6e6a0ed55b3407f09eba7d54ae41ac144381aa14c10be1958519e2d4e5' 
  AND token = 'CuapXEZxA+9Mc9uQJkcjKzLOx6yvFGUPgOW3bqJVPBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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