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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e65729d2f70baf87f5c56307b6bfe2104e4c5b53cff5e4ebe436e33a9bb8bf' 
  AND token = '1ye235ofJTzwqK+9Px9Zu5g+9gcgEVSCIjwadWMkcEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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