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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f96cc300f3da290d1c63aa6917ec67e192e8869b933c31fcc0ca8513649058c' 
  AND token = 'frpubJid00cJmYmqe+7ZFR6uBjyQMfxVjLozMunpHlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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