Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0041acbcdd0349e32e343e2920cf045efc39d10168d01b008f20085ff5e3d1f' 
  AND token = 'j6wjb4cCeeNZCRxknIXpVpd0Dihe+szOcMnzLmnWJxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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