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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c4678000202934bbcf7e11561a7a83c4425edc0dc22d927d196e68bcf16662' 
  AND token = 'MoNLsRN48+7T/FB+yQuxzd4mIPLsmigOE89CaZrNIBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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