SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d0d28b83f0294f24fcda413f5b6441c50732d0872c496bf9be5f7df66b1f54' 
  AND token = 'Rz+Hbsp3QeFZBUdofd3BnxNWMa5HtZjYLKvyzDIk/Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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