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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63253927a8a7f20934a102f5f909d266b22c0814c46d7d3011bd0913661462c4' 
  AND token = 'liDljR3rYYHLfWtKo9jIAAKGiPBtvAkbPL6Gv79cjeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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