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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbc6308880b60ed84243e583f011f38f62c1907bfa25d8c67ac07c2a9a98f38' 
  AND token = '9vCIPQjxZkaGVcVwOuCiJRwL0ooRlxh7j64mbE8DVcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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