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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b00e234a4f96f6eefdbaa0467b0ca8dfbcc2b0b5e4a5fc8731e0317f033738' 
  AND token = 'sxnWfU0foi7znSccayLWWA1mRtKzNM2mHpUJVP7LfjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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