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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6707f954d3269f638a3e33967b075a61cbf47d4b5b10cbebd36e9b7183b79f76' 
  AND token = 'FAIuanXdoEB/hLcI3jpMGoNX2PDllGBE6vG/0J2915I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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