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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8bbebe8cab284462cb3efcb97c08cc13d4bf2b335d17377d9f71dd6c0eb670' 
  AND token = 'u0sx+u4GTTPMOha1djqdobD0eplgMLeDDJ98PrsTpJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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