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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b67d3c3176769759addb01d7894357bad3967f46b56ca05c8e6554be9234762' 
  AND token = 'WoqoeGG42ThiQY61+A4Pzz8obM9wU+fx9jr4w0kpASA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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