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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d9f80ca802724083f252c4b2f72ced5734635b53a328c10cec5967281c29e3' 
  AND token = 'MemR8O4D4BxIcC8jLCv7fEma4Vew8N92TRzLPFPnWSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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