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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6b042c1aa6291f51b2fd1a50cd885f9ab0a4b2569425b1f258f6f17074b8ee' 
  AND token = 'MY8hQjBsM5E4bUd9DSPyvTTfIwWL64dlUB3mPRKtitw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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