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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad84a6ddcf541270524b583f193c7cdaaab6ed445da5e93eb853e54181c805f' 
  AND token = 'QexYfAmoAPWmx8VysyKV8nSw7LvK6/1qKnv1WY9l89g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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