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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f27320d1ac8eb72bf4eb0441c8b0d9d595e6e8db213bc89657fce31ea08398' 
  AND token = 'r3qCBf+mzefppo82JL49YM7hLvQkeArF8Ph7FXqWBBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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