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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13232eca907a39311bf05d5ba3e34cd9f347e33250714110c51ad396612387c' 
  AND token = '2XaV624B2tmB3TxkVZb635TqGZE1vnbcpV7WGq6N6hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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