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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4e56716eafd8fb145ef24ceda04090c7bfec75b5f4231d45d331106bcd14ec' 
  AND token = '8MuGFCDzL9GkIKqZLY55cT6S9zlaupUuUyOxj9ANf5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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