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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9a7d04c0515d9b6aed3206a840ea56cfd0c356986af49bd466de291f46d072' 
  AND token = 'Bm8kqPx0d9zFYyFKVxCCP7Kq1mA+0PnGomsXxuw8szY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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