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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a5b5b8dee6fde328a9cb5db2d4fd86074ac0c63d07ae29153cbd28cb957588' 
  AND token = '11Xr0wsmyt7knwO84X/cEtoGDEx/wvvWK6/kH5SU5tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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