SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af6432b4362618384479fb2fd4f1f3993c407e2da87288656ec6d8bfce98873' 
  AND token = '++YPGkLg1jmStAAEuSj1vKLcaIx5B6gURFQYUvyrHtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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