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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd15032014d513f7af3ca9ef33592517f6d5d5e8ffbfae0354af7ef8537c617' 
  AND token = 'zuHEd9yJV55NZFhmif3Ni6qjwZ0XGd2H0QO96NWUl5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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