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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc7a7dcadda0b4f9c322fcbfd6a4b8d9a2ebdf668af06fab1b3935a08447c4c' 
  AND token = 'Xw1yLHu3lPNWTzBJO0fSqfDUgBGmQapJgaMvk5nrPFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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