SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92147dceb99dfdd9f3aa451b926b401bd8b63a10de488036f550e028e5287bf2' 
  AND token = 'oykPvArq/ggpsYRqjMKrnIKdBaSmNzuqVoY5of5pQPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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