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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df848fcef901904faf62b85506122e88ffd57795b1d095709bb3bd1dbe735d5c' 
  AND token = 'zcQDvBo6q3v+x4UmKJfknxMszmb+4vyC2H2HIJhWb4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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