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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d29c81df6ce2fd79b8274e8dca0a6d574358e8d958d055be7e2f6fe8ccd6f7f' 
  AND token = 'WuEugKUZCH1mbSbACHnfemIxeotLGWqqle8bgepYlng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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