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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4546252c4a6f134e77ce6efe661623c178ebd45dec69993f2c6131afdf34eab6' 
  AND token = 'IHytmsvf9SsVVhTCfCUKwCeaIM6d1KCxlRjR6hbGveM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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