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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fe0c7efd81c913d5e92331658c1769a75afba5ae197d9b49299446bf21090f' 
  AND token = 'av55Oo/iASTY8ykqrEvMQII0jR1YOE8F+SMe4B1FtWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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