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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06713770251f1e7b1d55bda25d4b8dcea8c53911703f2772479f05ea4a331315' 
  AND token = 'A5P+ubORUp3C4oAsPTAkDGlQcTTxc1xIxNCwKJMXLug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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