SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a9a9299ff8b4e462ea8937810583f92613e2cf59be86138525b7fcb0f5d30d' 
  AND token = 'Nve83Mf7zPnmduqtgmNLhE/X+FPEoEQTngYwi7OZ1jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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