Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e558d5e44050d74b274b893facd0c723e6a6f13d2bad06f2be0c3e431c7a58' 
  AND token = 'XIkfxRHnad4sNF+rQcsWd7MO0d/TwD03NflDrkfLuAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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