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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3a6b9abfebf57dc1c7c95b4e8308c5afd2358a109571f7ec7e39ced7e9ee53' 
  AND token = '8gNAw1xs7gQ7yxX3gEnGMOafnqTjj/GGTXSpxm/k4gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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