SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5644b83dbe474e7ac3491f37b6c3b7ac1071d9a5b5f8edb34d8a5e1aab86fa' 
  AND token = 'vegFdlvovOI/KmDwNH/+uf+BCL21OBXtOqW9ogFZAIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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