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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe31583242baa7a3132af31e6d02f3b3b7224976813f0bd4b5d33aa4676d78d' 
  AND token = 'NAJdPvSPlz8uRZ7gR0DKreUfJGw36LinTw3AuOUYXOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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