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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83cbb5124526852dbfacf343e9b7adfada9d06442c0c0f5f7622660021cb9d7' 
  AND token = '1WIoZwdVpXLcbqTd6zJ54POPf9jCpxYA5ZOydpiMeGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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