SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fdaf1c6cc75ee124019a2a78e639d7dcbab43de85fb8a808d265f31d4ed505' 
  AND token = 'K2KUvmQ0xEvzfi3B6+x+vp3uXlo3vhWDRMGvujHZslM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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