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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831407247c15876ffa8090f5e3bd48b91a4553692f3246957aa04eceb8933a41' 
  AND token = '3J/D7PeF4YN62z+XoW8e7UyMwF/TdOa9YW2y06+fepo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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