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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb76e6907b459974b69845ff6de0211a1f5723ded6d53e78a6f320621c95adbb' 
  AND token = 'DSiOqz6F/o2h7Ax6oZqQ4hqeQ8OtWvo2xXXgKu9JZa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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