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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfe264f75999b8db44facbd067511b7bee2628c9d07a20637061eb0d9ab7c63' 
  AND token = '7DQHIQE3i73++eiDez4HfpN8zjqljll48gdcbVW5ym8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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