SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81cb20d682c3e5dd06141dc06c779c7184c2ca1e00b7b286e739cc6ef991e36' 
  AND token = '6GTbJkaKqfqpi5XFqlVzINj8SjldDAMe1cDyORZoc+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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