SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8dc9d1b6824f174f85849373e18dea8ad244450e4227b7fd7f6cf4093e84d4' 
  AND token = '1X2s6TzNWCx8ukDCKztUtBhF4Rp/non+ltwgC+YPI6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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