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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417f861d27f4a2c4c53c1643bff60bea846bd1e09a7df3fba4558a153d017e71' 
  AND token = '9wNvF1RuovAPT3C3JpGKoz5P4/DW6DpHsCWeHecxrVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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