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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61503964163c9fdbd906fab9bf18eda9b20f9f6a1c58664f09b605d73c214ccc' 
  AND token = '0Uaph0JwaJmvAMPp7TRYyp2llw8dgjKMZBT6kjbPh3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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