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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8260bdee7ea707d8949b8feb05da29761dd11f0addc0332011ec2392efad39df' 
  AND token = 'bOhcht7/voGZpUp9rUyaujSwwDGSTuq/SogiUUxRviI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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