SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610d92166e9f907739b132984a78bf96dc3517b386d157dc4b8427f9bcacb189' 
  AND token = 'MA++y7gyhvRzhGvB0vR4stwGZ4ZxhuOumxLk5s+0RjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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