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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd77da9e870a7dd10a4b9769bd87bbb716ed267bc39c7c82feb0f10b80b27838' 
  AND token = 'rH4NxAp1k9GBh2yb5nk0HcTweab2u10mnX5OwcArwZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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