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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df0209221c59d90619820d63f4de98032f6e1386a632af157ae3134712b257c' 
  AND token = 'yYJABYobvQ1215eg6Or1OB2R/v8jcHckqllxXh4NK50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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