SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46fab617e83b9b1a8d18e4066fd1cd585e0d44c484d6939c8277b19306f2a29' 
  AND token = 'TZffwcX9nrTWZnMKxZvpvuRMwZmHq+SnPYhAsQElYag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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