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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016d33ff9765ade632cd480be3a4fc24ef459e858fcfa848d53cdc2214ead885' 
  AND token = 'BzayEGWTJTcI7HTJeWWYomj8uel9gepDyq1CbfA704Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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