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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716c3d9c2a391991bfcc2019ab4e63dfcfefebc4ed50c3756f80699cfac04e37' 
  AND token = 'WA8PDeiXh3KkUZib45H//Vh3bJb/mgEzSL0/yo37eos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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