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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf0675165a970d8c4f70b126c9ab6ea57231c7cef6a46ba279e5a3f3a5c3746' 
  AND token = '/Ekk7zk4lKwjOUfTf+gZ9vj/DH7jTgowikhjZZs5rH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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