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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e3086884063dc58fa22eb66cb076cebed3a972cc1e322e06f9567d649d292f' 
  AND token = '26djQyjcVFeduYXsNaca11f0P/qjquuDnHSd5Q8+w2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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