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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b007821ddfeef944e664cd2ef865ec01a66b8330ec1884140e0c36e8d3845a49' 
  AND token = 'hzGWGgDlF/WOuYgYHdNc9qtwlJbl/Q1Jtxnrq6bFkGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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