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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8b90264e1c6db7d2150a149da7e3ea483229148921a012ff020a70d490e16f' 
  AND token = 'nZoGwvcvaqdlWekh8QBB5Ay7Fooacz0eO+up9g6cMAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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