SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df472a8e1575d3862b01569f9e9f89c7304518a341a59f5b14030ef571a343a1' 
  AND token = 'GiymMVCEhOnqMYTHcU/nv0kuPmggKWKaYs9nTSYeYJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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