SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b16cde0e826abb576f95f574aa39a1316d1b6d4930a8ac7438adb86b9b615e' 
  AND token = 'JADwbyxBgjmPoM2CkTheUcDcG0IZlnQe+j/KnKtuBNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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