SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad964c50475bc8e23b61698212a5ecea09c4fc41d16ef48680a11d35b2bb3a1' 
  AND token = 'LlSzpS73UjXOGNqVHvgIkNWE8Pv+EfGM0sB1OOeZs4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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