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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7abce91ffbf9157831d0486deda9b5511f049086edf646eef5df17e4a6676f' 
  AND token = 'jqB+jR88u7oay4AcGm46avoN80Hv7FUHoc+zN9jqlBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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