SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dada3828f8e40f162525fed3975d9e39fdefe344a4ae42753f2a53880f501e4d' 
  AND token = '/jWuh+gPvbqO4jRHMB++rP/xrcQohbiYqmcCVo6FcWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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