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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c528e3faae24f58f0c96bf0010f7c9b3b0b1fc0030b2df67b0d865c9a4833ae0' 
  AND token = 'zfVHq3/8a4dtuuuTUMZDVKxN+DEbL16WQMiyhsRrVWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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