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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5a775c0659db153b7b8f60410b5bc892d9a3045b57b99c68d820213da6eb0f' 
  AND token = 'cNL3BFUTF4wjqNjjYUOnIUDYnNO72+hPnOaffH0h9k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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