SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05539f88d373f317d751329168d4a001ebe662782c00e41245c2bc89b4b5c089' 
  AND token = 'xK2KgpeZYsyS0jj+RJMv/ihC7GoqEgrC0KNeiwT0oCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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