SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0775eb3620e9a77deca8d61671f62bafd19a41f6f250b6a5ab09f6158931ac3c' 
  AND token = 'jqAnNDwvwuNt4SjBZYoFMb0cUvhGyAUh98ZMqC3hZzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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